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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff8007a8fb9a358de7b67572676f709d0c5bdefa8b20f884678bd57fe0e115d' 
  AND token = '5UrlCZ1BtPkOCboQJpC8YIqHp9unoRXwAu0xTlOO+Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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