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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb540dafed48164d83900f3be0a677578c2f1a32a4e4c34146fd56e62b43c99' 
  AND token = 'kwOtkia3MzRP5VEv0TcOZa5PflA6kxroS7+qdkUAwIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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