SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f964d8772531426d3f28885f0ad9ac57168615b10a159b17d85a62cbe69395' 
  AND token = 'iVzetLX/CqN8inNHHpkU7dH1+znErDuVYyspxEcvJuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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