SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e5bd56b5b9ae9b079647059639b2f3cc9a0efe7b8e580c5b11b307ff515418' 
  AND token = 'Wt3iOLjI4L8EwbcYXxuS3N1CVwbQ7PhI2k6sD6rtLQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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