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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e64afe85d034b11e33f03e06e8a05033a5dfc1554ac7c497ce9199f16c8c6da' 
  AND token = 'bM9ccGSwqnIQsK+I1TgpX1WxJvtLAc3HXDtIYuhdL6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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