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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce87623b05826ad8d8356c6a71da9ca44b615af76ccd48f36178c7b7774198db' 
  AND token = 'h+sn/UXBftt5XpNXeScuKTmSrVfV8aM6/AwQtby+w4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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