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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a32de1de464df3f78ce3c646bfac4c10465a2a1426c79348f8ec32c9e853cc' 
  AND token = 'xlD9LbeBw0B7q7y1m9y4bmRa5kQTDc2CQ7jFJgSq12A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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