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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc186fea2b44879c07c6fd8b05e30a06eb111cc56f5114b5784e05921df79b0' 
  AND token = '6zQAg3ReuawuRuPlYSv0VZ8ZeaNdNw31vZmwlmJmoiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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