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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0104f62a43d59131c6cc1036e1c09c3e94637a63793929d3e446959e341c0bce' 
  AND token = '9xtrf8C7WAdQinK0W3opUjV1wEzLEs0rYuQbh5LH6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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