SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779a625245ee3aedf9b6001885bf4c5c33c3f3a16842dbfd8f3c18657324b7ea' 
  AND token = 'AXLyqFJksVbsmBzMW+TLw0MmPY6V9gyaQNCyg0+wP94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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