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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179e6340fe69ab288205a9d75c64c9d7750a2ecb697a1282cc1db81272843185' 
  AND token = '5LyAVr5Z0XUebAD8ZPWzJp6BnGdk8fxMgejQj6QA5ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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