SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54947fcf7d7801768499f0062e11feb9c9454d8bd65fecc934835fcaab312104' 
  AND token = '2DrtVM6GsRCBEe/jzbXbC+Lpgr1kvL+EBnBKQDRhohw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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