SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1a159bd6161e8e2dde414c747ddc787adc304f711313a6c96a86f1f95f921b' 
  AND token = 'YGgrZbYFh8r6oj7Jkh1m4BeQFxKzdTBhnXV0XzomdAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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