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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5dfd2065ed8443b20582ecef99d0e28479cf6dd9db1e7c17ff7c6b0c92d534' 
  AND token = 'WcXKDpbOr8AFmShV6wOnbSMYaf5Tg1YAns55kajn0uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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