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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7370e6ddbd4e50947d0880f304073cd6e1bd67387233ad59cea24642e31f0f05' 
  AND token = 'lQ98wJJhCKlpxtug1l+AHdK48IwHWys4RDhJXPMgZbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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