SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32deb8a2b24c8328ec91c520005af2d6aa4ba128403334a7dbab94babd451a69' 
  AND token = 'sluCuJsWJEBnHXfknlOEEwMfDLt6Anc0IEiI25ez/Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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