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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f3e80e4f3d365dcc1054803d80781d61ad04a57db1b0f9a97d7ef76816214a' 
  AND token = 'ez3+eNNaErYVrpmQvKaqPnxEFQ41iWtDsTghAeYzoj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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