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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba0cdc5646a98d074e169e1ebdbd6bce3f66d6b224267c993f7a6e166c53edb' 
  AND token = 'dDwVvkT2otJblHqVfyQUd2eBytBw3tY55HUYejy4cfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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