SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26facc8307237c93786e5cc5b4c58fc938d930c87918a7435025697987968ca2' 
  AND token = 'lUGPKg1kEVXLGjPS+/SBcfZ6JHuNWS+wTZUoArt+MQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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