SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8487fb35871fc751f14095eab34fc606f3b7b7921dd237cb6a79b6f510eef11d' 
  AND token = 'JvmR/2k9hh5kFC3GYznB+tOnZsYXfOLa6ftoKPl+Jqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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