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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13af759c140b11d33da444a4773a8616db19b36e4cb38886e79a02a4fe6280ea' 
  AND token = 'oP3MxA6dsFgVxeP/Rs43UhQuCUl5FwK9NzHCdxatiyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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