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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5598d3a863f6b5e165d735988fc233656176a45e5ae164572a4a37e8aa60b5f5' 
  AND token = 'oX8wK3WU20rfqPPDaSAr8M8hqpMHgN1KjBQceXSgvo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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