Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e234f7b04ec96713a20714383a7f4af1234b33ca78a9352ae67a1bf858b0e2c' 
  AND token = 'wDLokVIojOx8bCr88n5RuY+VznJNTlbeeuTEvdKb2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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