SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89db52069d03d3ff446fc5b308b515f1daf8be388b6fe81a331abcf943cf67c9' 
  AND token = 'TRQqa6k7DuqBL1MUG04UPSh9wlwtJVxyafWI/ZcPUAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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