SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea1b114d798cc0b0694dd842275595e248d3c7993bc14db08dffab7b1080722' 
  AND token = 'HdeXqIaBirwDvUzj7VbXm/0hJNm5gy1y+7Ros61WRFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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