SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5336c2dab89427f611d614de130886ff67fbea1150febbe543be8468c37dce11' 
  AND token = 'EC/kKDLIHebJss1P5eZYDqI1Sh9zyjFKJGBw/2X92Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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