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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0eee72fea5e27ee0a6d599f02cb70d883aa04eeafdaee9f6de851c8233ca5f' 
  AND token = 'Py1lVkhW6Bfz8AC7dYnPeTf9doJrulmCxhB5XU9KMZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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