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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd66c3dc22407a7230ca3a19d6eb3637f0ab1f7d8c39a5af56ab57a81cd60783' 
  AND token = 'DxtKHutyeAkyT/vB0ZwH58+me6BLC2ye8IFILZjnRXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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