Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb3e8815d9fbbceff1be38f05e5842de52ffbcf6aecf59cfd0696036ecb0cf7' 
  AND token = 'dew8r8TlCJD93kBJz+BeuTZCxRcwwUXrI8ko8wJMkkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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