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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c92d53578c18e7e44fb417263c1fd133efc2a159443add7f1394c08c9fde134' 
  AND token = 'NI3ngrZSxnCATuTTGNuazX1HTOc8/insVUhV6U+5/B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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