SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd99c06af4eed34126ac4d92b330c7be22d91fbe583fa584477d77dc6fdf7ed7' 
  AND token = 'eKPPIk2CKvGGJx3C+uO+8Bk5pjMqXg0zeBnq05S8RQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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