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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac77b6f3e0519830d8ed20cfbbba9d7fab5373f60370db0b942c2c7854ca07e' 
  AND token = '7036z/UdO6Jd6+GT5QVx6xiJtdSiw8Ds+RCMOpctj2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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