SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafdad7699fec43b9f42717cbc6cbb528a06fd10e68a3fbeccc567d736a49889' 
  AND token = 'K8vvVr7NtiJ/ToYjYUJBnz6xOWgxCP3A0BHON2CS7ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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