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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795b447c7917956fb080b9137345ae3b97075e5f9a9c48319bc0e3215c8e00d9' 
  AND token = '5A8Dnud5r6H72gI0S8HsrKlx/h3iPycE4VnhO5YD6kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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