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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1884d5b76b821e6ba8b8194f91e480d58bad498c6dbbaf56e18d56d0af33536b' 
  AND token = 'HBOi1ZOXupsvx/9azCQBU0V0kQXaE797/FB9I+tiH7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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