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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb04d8b02d587d88a830d67f200032519845a6fd031c11fed31705ec19e6984' 
  AND token = 'cmB/EUYbvrmmYXaZjAwKS8Q0nE9qYaU6dptKQQ6wYiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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