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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84dcdac3c67f13cee96adc2563438449b1c2ad4d42bf081a3f63baa537e7c7a1' 
  AND token = 'B6tKQpgbKbzBm3bqab8QnMizxBk+cUgHyfUi0dpHW4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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