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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68c5d33af471385c536681045648572bc943a178e51f132ec8afc860c2598a6' 
  AND token = 'SqK5S2xXww9zbqpThIxUSUk6Chl/boWuj+MDskk6x9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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