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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09261c3816f09207c263bbee76bed9f7daeb82732eb57092d5a626e3dddce5c1' 
  AND token = '/Umq1pgbPx7Vwj5zi4UaTrnFpn38lEtrO9PAhIGCmCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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