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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bbfadec84504c8a9dc7ca46d2a92ec688247e3604d76590551ed205f23fd3c' 
  AND token = 'pBvFMubv7XHxMT5wrtC5d1w35VIOzz/Tg16mRIWhsbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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