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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9848c3f7c3962ded9b633349a4f721290a5678012de7d714a89e7a532e457801' 
  AND token = 'Yy2dhRyRTqK1Q99BvfHZ4l61RxX98lowxzyz9OZ0hWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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