SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abc88d3e9d6d00da65cbb82b36885e2a111e440c3e4d934a8097aceecceb760' 
  AND token = 'v7hdOYPlzQFgrasVL5gKkGmgCEKupV9nfAe/Jj5V5JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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