SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259297e9a1564bb7ab3bb6549c2187f8a0886ba9d9a3ad1c234d26ef5f55006d' 
  AND token = 'QJVW/bofxX5Sq0LbDj6rIjz6mpX8aGlQFVmyDefYgZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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