SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b4210573b8c747812d96eed4492cf4938fa1f4f55cb45d9bd7a50bc3b61862' 
  AND token = 'BfI181NYjkIjnuBOKCOAEyVjmmLqLuTr1s+H2mYOU/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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