SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f5c4116463b0cc9178a504a73d33025451324f88d8b57b076774cc3552a3d9' 
  AND token = 'R6PAWGzJgPCo+HcKvsBZzBnLOQe4IpoPRuDkk5lAM58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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