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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ee339c5a173852bb8610f5795974a00b5e8ce42eb34c9881011d09dc826a0c' 
  AND token = 'amMG0cpiz5VH3elqEHa5pGdM3ahCtdEuLsSLnsqoKlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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