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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3129c4a8ad96d99b5efe6590bbeb046121ce7e1c0762bd00dbf9345bcb8643c6' 
  AND token = 'RL0kxBgwH8nz7oUXwrl9o8Co4oLjUi+/c1yoGPsFqvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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