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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7aca21a011ef03a7282161439487e9abd88a8d92784fe4c3cf4f146ea36d47' 
  AND token = 'N0aVknS/K9qovYngp3J3/YHS4g1OOqofQtMZRSQzsGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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