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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f6d4383c6c1bfed07728c85ff751716369722f12f99751096036e2a994d5a4' 
  AND token = 'RvCIqNlAk3rVxMpb7c8/rh5XWcQpdlUN/lc8lDAeLXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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