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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b131bfa575aea6b42f325a363653b53c0cc23ce85c43ef7a6bcd75c2dfbd6ae' 
  AND token = 'eb7GVt5/wxGWbzTbre0p6hxnLwZhliXUtuGHsqEsn4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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