SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c11c1f0225aea5eb589874767215c31c90f4066539289afcf985e08ada3114' 
  AND token = 'pIz1nYGYthdbKxWhVpO2afDZvp6jAjZP08Qi7qZDh3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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