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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df42087f917bcceb5af8c59aa8a03a15ddc246200c9c87e436de23658e2f64e' 
  AND token = 'PVW2xGHs8Ci4b6yIAAyPlK8lydJNhXYMNWCxhngpUfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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