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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99c1bfdf78a131e401d0ccc36786f68d617063e56baa7088a2bd782888304b1' 
  AND token = 'y89O4KtA83yom06HsE1Amuqtd68mEie9en43hYeTbHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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