SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfd9d67d7f30b8df80b28baca5ce27ad12b3ea16655b3e04afa5218ff7175f2' 
  AND token = 'CldD0fP0C/B+jBdp2+vnRKYzPG4nQciZaJIieTlq1P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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