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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd283f3c3c6ac1401b20c089722403879a5f1351750aeb3a2635e311d9afb9f74' 
  AND token = 'yQtyja7Snxk/xpwpz6X5Xe7eGaprkvPbX7nXFCu6gw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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