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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057e438be5c161b4b9a1bbe291bcda47c27f0de2b58d14acc53ab631660d3263' 
  AND token = '3G9WM/Gw2gZoIXOv5Ulf0LBOESgI0DTNToM8FXSMFvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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