SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f778406eddb68c2852f3429ef59572a4486166372ce2ea640c0591ab638f6d1c' 
  AND token = 'hbuwnu+pxlSauCoja4Hyq7XDOYS/HfxdMbqGmqzOloQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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