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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4975c7e938d6df83e4af24eee13134c19887afd6c58b950e8e6e79ef03266b' 
  AND token = '9MqCbV5aSXGgGR0Gmt1PNUdryGqW+XNb2WZEARovPzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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