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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4c146a49c6d83f090353b1d14fcc47bf4c35e3eeb55a234abdcac6bb115260' 
  AND token = 'W7aqZ+NPjeRAjsrKT9RYSWS2UnDfc2FjIro7/CqGD40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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