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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6326971abef28b26ff3621d76f5ede23236a55c877ada55fbd2be56e3ac263' 
  AND token = 'clid7jrL7XuSY4o8nHXLwWuqt1VQ0dY5veG0zcbAJTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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