SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e8c2bed8e9ca18d579845618068ed6664b105828eb37ab736291f2496d73d5' 
  AND token = 'uZcYTHslf9l8ThwEoIGU+V4HSXOvrKvYVWJqT10lObs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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