SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d28c4e8be7b5d36ff8c1c5effdb37a16b02dd622e67fc472f89820593420e30' 
  AND token = '6xvWb0RdlhHzwaRZ3JHSvDagXGd1eiFbD/nAwknpZUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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