SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2689a5e340dd872d6e1c070d2d26ee4539b04b9f0631f154608cb21a7a3aa97f' 
  AND token = 'sY+9jUaH/GlB+tj0HMxfvk8RAnfA2l7TO/zFdCgkLIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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