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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d5bc7f7a60fe779dc7e379de6043705841308a1eef92de481e95eb1006b63f' 
  AND token = '+yvnZNlBz5982Ku+p5oqVlw2bE0deLkfbo5WouOEf9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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