SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85133d68985517fb90f0b8d88298d4b600f8881a9f721958a39bb771ead7aa0d' 
  AND token = 'Bio2tZozMYOJrPmZkJGvULgQnqZtg0Twln8bhOVx3b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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