SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0bf098f8587fa8c87433ceb93a71e0480012589cd410cd281016c2bee2d9b0' 
  AND token = 'ivV/CkDrTYx/r0FwGpB4hHB+KMs9vsImXudrnhF1gGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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