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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f15acd0d1215c1cae67d3cd9c1b50f58118d7e01bd4da42e5ebd614e7905458' 
  AND token = '9wRDkv7qUt/X39QdI7liAGbWyuYq79mZiTcEAxc1+2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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