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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5eb5a75f985585f42ddbf9cfc476ec1e1e391a889cba2fee3d56ff1164876f' 
  AND token = '9H99IIWbXqrEyrOvxRmFkaY6QvpQSrEAcY6rRVhA7sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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