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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011b5a20c37f9ee43a4e54883a7ce4f2783b859353d923fb48cc9bc3be4a550b' 
  AND token = '6900iGfBsArVqlJbWn9es6uiVTgivofyZYLU8uxg6ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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