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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc796b897b3f10d195c72ea50a8136b1fd05af2e441351f4c99df26785ed1817' 
  AND token = '+scryv6h2o2EdzYKLHvs/gqM8kEyRI26aaOz6/xlpBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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