SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f643a6ccf5de77ac4293b0d2b51f88df40d334a59725002ca87e849a494311' 
  AND token = 'JIVIgXJLZ17xKx81Fn4rMrv0CZLhsDduZos5J/gjC9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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