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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3ca92937c29730ca7f4b1417e061b3add8cc949cbe8c92e0421b3d75ca5c16' 
  AND token = 'Vzq1GGRdnZXis1AgwfTR3QQKnz9u1bP8XkBc09oZu8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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