SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55830bee5f6b0dcd68ac23b4d33804fb9253c266d2c78865ca6f2b13685db4b9' 
  AND token = 'ozGz0dMhgx/hPctg3TwYaEnSKYMJYZjUBlK5yK6AOrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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