SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336468f577345a22b73f90119b7efd1ba79767f0bab9bcee41d993e400f0682c' 
  AND token = '3Zk1HwjnyzN2d5QmwlrBwCq2mgmg//B8s4OChxjbR4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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