SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2b9f871c2031b8446393e86ebb5825a46b92df3b20abf714637f5cd4eba790' 
  AND token = 'vKO6pTckS7z4ncvVQFuXNOhfWuj4RjewSN2LSZBfIKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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