Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1735820f4ccaf02f80c1f5154c05df24c75aa967b93dab7ef3ced305fde2a23' 
  AND token = 'JdUamm6hJNpmkVjjnJ87b3rwkB0cPkb5vfe0vddT6mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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