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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44408b47b7f3cb88c0eaa925a90040b1f7484989efe8d71461da0b07a472e069' 
  AND token = '72lGojv77PlPni/S5bHRMXwj5vP83hwFQfMgxp4dftc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}