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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea4bf2d24b36bce57b7b481b1e8e52fbb7ad9d5a1fd16c3fa57777866b1edda' 
  AND token = 'Wt9YCHpIm26lJyKnylRmn1+9jNtnY/16HKmVL0X5jdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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