SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d05fd05a6ac2c108cef53385db6b96753bdec41c944ba12b1f547fe531e4f96' 
  AND token = 'C9J/V9sE4coL1/uLQkOdH51TaEX9D2eE6cT3IlO7Cmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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