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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cc4e24d37030b4e91df47816de2654a44548cd14eaa3269e3005afd6ebb59c' 
  AND token = 'sxlG+s7NYFYR2hk0MjEPqSCS2FxC6xcI9c/wSg969yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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