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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827ef15fbbdedf1f97c288b89b6b5b8ba42eeb360ba33669ded71722dd8492f6' 
  AND token = '2/wKCy4k5iOdLxGO8XESi1jViWdGP7A7v5IsXhIstqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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