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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9434f93e6659d5de65118a0754c996bad8de148e078a632d8ca399e69d2cc9c' 
  AND token = '8EVLOoU+2NbXT6avB8C62oUC76kg1hhg1qj/yobSDt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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