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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e56d73cb8ba0203259e09d055c9373eb8553e840a3579a35191d31173a76347' 
  AND token = 'uXighDJ/7bwGUBTwUDfIsG9hEsngwJKNnwCMxCkimMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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