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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0113e03ba3e5183233d74aac00f80f1c836457e91876d6925bc6f6bfd69dd3a3' 
  AND token = 'tKSG8xV4wc+y8eLE8Dqt1WkzPnhcWtPuoTbOd6evKvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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