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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b518052f58387969dbe14073538c13cac83192d9127ea3db6d33304744359729' 
  AND token = 'b64fQX86u13jDJ4sf3VaXh0RnBcaHa8qltUDTJLq1MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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