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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb440de2f0111e4e3d7d20c785d126efd0bca5edb83b3eaba6b0c38773b53e2' 
  AND token = 'fao0TzhO+xFsAEPoXAh/HbWcXJr79n29mtM5bGcjprI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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