SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926cf8cd31b25839b145087e68168c65d525ab368f8e09b77a4ab655235e9a25' 
  AND token = 'BxQS63cl/PBQjMuY4+lKWUu2LKQLsEtw+QnyCAZAHc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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