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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8283f4b5bbcd35bbad53edb40c79f44139fd38c7c8c97f4c9544e89ee1359946' 
  AND token = 'DyBaCw6w72SurMbV2gNEV8XBjn/FZ96S3MsDD/OZm1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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