Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c624e93d6013da060ca1ebddbafa916de702dffcc1d297c3d3a0c8597ba22da' 
  AND token = 'Bky9i6h371xwfmB8y3wa/QDB9q9iuuPs+aUDXXgoBBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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