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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dfe5649466f0e3c71462e84007071f55235a968c554a698c1d6ce6f703821d' 
  AND token = 'NeyI2+K9gKKKbd6J2T2s+XQ9Qfxc0bfARexoP/P8gqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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