SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1036b61d5da15e3541d79846923ad24ab6f51a6c132c2e0fd36c7e3a8400a4b' 
  AND token = 'zYfxVh7D5gAbw/IAi8F+B4PH3v4l1l+AZFkBeLZvlgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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