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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae520cc3140aece76946da896512a23ae335da35c526beb7575a67b877142f3' 
  AND token = 'yMrBZ/e2tVYnHdTgmk7Nr8+Vda/nikNXgrOS2Oa1vCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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