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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c74d10b63801d438af1f4f926a8963544fb096cdcda079bfe5dc79328cbd7b' 
  AND token = 'QG0sw62L12jG0QHb9joLcRvuyMK/lstElyoKQMUMST0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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