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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec497be4e40bd56c93f87928fdc10bd249642e8d25fdf8464d2e7b282177107' 
  AND token = 'xnvcMyiksLbq+Snvhr+Fq7w1r+n13rBF5fRoMQ6TErk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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