SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966d2cd95410b46e59f9903fad680bd1dbcafd9fae4e62026c5c96c188ccfda6' 
  AND token = 'Q/LTyGLYyQVOKWHRXKraNn0UcWMXP+q3CSlwjzGJqmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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