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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bb334184032634194aef4366de32e4300cc2e85523e5dad0837add80a19077' 
  AND token = '5EPy8UWMhhy4NUNIQO0GQZln8kokC1GS8SDzok0INlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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