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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a55aa3430b94f9cdd22c6f7e8e9c6a568a6d737efa20a92e6c3aba700fab75' 
  AND token = 'xfZPgoCo/3V9O+YjfpmVHgJcFwcjUcx2Gd3PC/e/YoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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