SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a086f69958e92e25d3c51f72ca83749b24e4e1d8c5dd6e64b860f052d97a7ac' 
  AND token = 'kSw7+ffVGCqlmSgqr604lktZ1FC3uhQGovizadSR1nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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