SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf94fe757cb1c93d9188204ff25fa0580aeb01fb1d4447291d71a83237fb5ff3' 
  AND token = '72n9O8J68gRNQ/K6zH5zfyXjQhvW4LmJwtDSP2VYK6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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